63 lines
2.1 KiB
Plaintext
63 lines
2.1 KiB
Plaintext
--disable_query_log
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set @@session.explicit_defaults_for_timestamp=off;
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--enable_query_log
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#owner: link.zt
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#owner group: sql1
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--disable_warnings
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set @@recyclebin = off;
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drop table if exists t1,t2,t3,t4;
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--enable_warnings
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create table t1(pk1 int, pk2 int, pk3 int, extra int, d int primary key);
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insert into t1(pk1,pk2,pk3,d) values(1,1,1,1),(2,2,2,2);
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select * from t1;
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insert into t1 values(3,null,null,NULL,3),(null,null,null,null,4);
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select * from t1;
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select * from t1 where extra = NULL;
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select * from t1 where extra != NULL;
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select * from t1 where extra <=> null;
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select * from t1 where extra is not NULL;
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select * from t1 where pk1 <=> null and pk2 <=> null and pk3 <=> null;
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select * from t1 where pk1 = NULL and pk3 = NULL and pk3 = NULL;
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select * from t1 where pk1 != NULL and pk2 != NULL and pk3 != NULL;
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select * from t1 where pk1 is not NULL and pk2 is not NULL and pk3 is not NULL;
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select * from t1 where pk1 in (NULL) and pk2 in (NULL) and pk3 in (NULL);
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select * from t1 where pk1 in (NULL,1) and pk2 in (NULL, 1);
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update t1 set extra=4 where pk1 = NULL and pk2 = NULL and pk3 = NULL;
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select * from t1;
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update t1 set extra=1 where pk1 <=> null;
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select * from t1;
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update t1 set extra=2 where pk1 <=> null and pk2 <=> null and pk3 <=> null;
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select * from t1;
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update t1 set extra=3 where pk1 is not NULL;
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select * from t1;
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update t1 set extra=4 where pk1 is not NULL and pk2 is not NULL and pk3 is not NULL;
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select * from t1;
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update t1 set extra=5 where pk1 != NULL;
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select * from t1;
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update t1 set extra=6 where pk1 != NULL and pk2 != NULL and pk3 != NULL;
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select * from t1;
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delete from t1 where pk1 != NULL;
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select * from t1;
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delete from t1 where pk1 != NULL and pk2 != NULL and pk3 != NULL;
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select * from t1;
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delete from t1 where pk1 = NULL and pk2 = NULL and pk3 = NULL;
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select * from t1;
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delete from t1 where pk1 <=> null;
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select * from t1;
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delete from t1 where pk1 <=> null and pk2 <=> null and pk3 <=> null;
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select * from t1;
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delete from t1 where pk1 is not NULL and pk2 is not NULL and pk3 is not NULL;
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select * from t1;
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delete from t1 where pk1 is not NULL;
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select * from t1;
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set @@recyclebin = off;
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drop table t1;
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